r208512 - in /trunk/gcc: ChangeLog testsuite/Ch...

[jakub@gcc.gnu.org]

Author: jakub
Date: Wed Mar 12 12:59:03 2014
New Revision: 208512

URL: http://gcc.gnu.org/viewcvs?rev=208512&root=gcc&view=rev
Log:
	* tree-ssa-ifcombine.c (forwarder_block_to): New function.
	(tree_ssa_ifcombine_bb_1): New function.
	(tree_ssa_ifcombine_bb): Use it.  Handle also cases where else_bb
	is an empty forwarder block to then_bb or vice versa and then_bb
	and else_bb are effectively swapped.

	* gcc.dg/tree-ssa/ssa-ifcombine-12.c: New test.
	* gcc.dg/tree-ssa/ssa-ifcombine-13.c: New test.
	* gcc.dg/tree-ssa/phi-opt-2.c: Pass -mbranch-cost=1 if
	possible, only test for exactly one if if -mbranch-cost=1
	has been passed.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-ifcombine-12.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-ifcombine-13.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/phi-opt-2.c
    trunk/gcc/tree-ssa-ifcombine.c